Record more download resumption UMAs to analyze the how download is resumed

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 7a08fcdf5b8b6e887f346fd4af37222fbc4ca671..34f5153a54edb035a5f936c1a95261d415fe74d7 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -30152,6 +30152,17 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram base="true" name="MobileDownload.ResumptionsCount">
+  <owner>qinmin@chromium.org</owner>
+  <summary>
+    Android: Records the number of resumptions for a download by resumption
+    type. For all resumption types, this is recorded when a download is
+    finished, completed or cancelled. For automatic resumptions, it is also
+    recorded when user manually resumes the download to clear the auto retry
+    count.
+  </summary>
+</histogram>
+
 <histogram name="MobileFre.Progress" enum="MobileFreProgress">
   <owner>gogerald@chromium.org</owner>
   <summary>
@@ -120532,6 +120543,13 @@ from previous Chrome versions.
   <affected-histogram name="MobileDownload.InterruptionsCount"/>
 </histogram_suffixes>
 
+<histogram_suffixes name="MobileDownloadResumptionsCountTypes" separator=".">
+  <suffix name="Automatic"/>
+  <suffix name="Manual"/>
+  <suffix name="Total"/>
+  <affected-histogram name="MobileDownload.ResumptionsCount"/>
+</histogram_suffixes>
+
 <histogram_suffixes name="MobileFreEntryType" separator=".">
   <suffix name="MainIntent" label="Icon click"/>
   <suffix name="ViewIntent" label="VIEW intent"/>